title: Unique molecular dynamics of structural elements in an asymmetric Janus bisamide supramolecule characterized by solid-state NMR.
abstract: An asymmetric tapered Janus bisamide supramolecule consisting of 1,4-bis[3,4,5-tris(alkan-1-yloxy)benzamido]benzene bisamide (abbreviated as C22PhBAEO3) can possess three-dimensional (3D) long-range order under mild thermal treatment conditions. To understand its structural formation and unique phase-transition processes, the locally detailed structure and molecular dynamics of its structural elements in disordered and ordered phases of C22PhBAEO3 were investigated using various solid-state (SS) NMR techniques at the atomic level. On the basis of the determined conformations and packing structures of the alkyl chains in ordered and disordered crystalline phases, along with the geometry and kinetic parameters of the structural elements' dynamics, this study addresses the self-assembly, the phase-transition mechanisms, and the relationship between the structure and dynamics of these asymmetric Janus bisamide supramolecules.
authors.affiliation: Department of Polymer Science, The University of Akron , Akron, Ohio 44325-3909, United States.
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Hao-Jan
authors.initials: HJ
authors.lastname: Sun
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Miyoshi